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Securities (Narrative) (Details)
$ in Millions
Jun. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale $ 29,052 $ 28,481
Number of individual debt positions in unrealized loss position | security 479 1,652
Asset Pledged as Collateral    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale $ 9,500 $ 9,200